Answer:
11.25m
Explanation:
Given parameters:
Initial velocity = 0m/s
Time of running = 3s
Acceleration = 2.5m/s²
Unknown:
Displacement = ?
Solution:
To solve this problem, we apply one of the motion equations.
S = ut + at²
u is the initial velocity
t is the time taken
a is the acceleration
S = (0 x 3) + ( x 2.5 x 3²) = 11.25m
Answer:
1.63 s
Explanation:
The skier lands on the sloped section when the direction of its velocity is exactly identical to that of the slope, so at below the horizontal.
This occurs when the magnitude of the vertical velocity is equal to the horizontal velocity (in fact, , and since
and so
.
We already know the horizontal velocity of the skier:
And this is constant during the entire motion.
The vertical velocity instead is given by
where
is the initial vertical velocity (zero since the skier flies off horizontally)
g = 9.8 m/s^2
t is the time
Here we have chosen the downward direction as positive direction.
Substituting , we find the time:
Answer:
c) paractically the same weight
Explanation:
The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. For the same mass these twice-as-high apples have _________.a) 1/4 weightb) 1/2 weightc) paractically the same weigh
from newton's law of motion
states that
the rate of change in momentum of a body is directly proportional to the force applied on the body
f=mdv/dt
dv/dt=a
f=kma
f=ma, where k is constant and equal to 1
a=g since the body is falling under gravity
acceleration of the apples become acceleration due to gravity
W=mg
since they all have equal mass, then the weight on the body will be practically and obviously the same